JP6013837B2 - lift device - Google Patents

Description

  The present invention relates to an elevating device in which an elevating link mechanism is installed in a passenger compartment, and an elevating platform that is driven up and down by the elevating link mechanism can be retracted in an upright state.

  2. Description of the Related Art Conventionally, there has been known an elevating device in which an elevating link mechanism is installed in a vehicle interior, and an elevating platform driven up and down by the elevating link mechanism can be stowed upright. In this type of lifting device, the platform is moved horizontally from an upright state during cargo handling, and then the platform is driven up and down by a lifting link mechanism. Furthermore, depending on the user layer, there is a case where a light load is handled, and it takes time to use a lifting device for loading or unloading. Therefore, a structure that can open a platform in an upright state has been proposed (Patent Document 1 below).

  When the platform is unfolded horizontally and the load is placed on the platform, if the platform is accidentally opened to the side (the platform is facing the front and rear of the vehicle compartment), the platform support is moved to one side. However, the apparatus may be damaged, and it is necessary to prevent such a malfunction.

JP 2010-269744 A

  The present invention has been made in view of such a situation, and the purpose of the present invention is a case where a lifting platform that is driven up and down by a lifting link mechanism is a lifting device that can be stowed upright, and the platform can be opened sideways. Therefore, it is intended to provide an elevating device that prevents an accidental start of an operation to make the platform open sideways in a state in which the platform is horizontally deployed, thereby improving safety and operability.

An aspect of the present invention is a lifting device, a main body frame fixed to a vehicle body floor, a substantially parallel link having one end pivotally attached to the main body frame and the other end pivotally attached to a stay arm, The first and second arms provided separately in the vehicle body width direction, the support shaft that is attached to one stay arm in the vertical direction and is rotatably supported, and the other stay arm is detachable. A column provided in the vertical direction, a pivot connecting the column and the column, a lifting platform attached to the column between the column and the column, and the first or second A cylinder for rotating the arm by rotating an arm, a column lock mechanism for holding the column in a mounted state with respect to the stay arm, and a standing state of the platform , Allowing the unlocking of the strut locking mechanism, in the horizontal state of the lifting platform, and a lock release preventing mechanism for preventing the unlocking of the strut lock mechanism,
The column lock mechanism has a hook provided on the column side and a rod-like member fixed to the stay arm side, and the hook engages with the rod-like member,
The lock release prevention mechanism includes a release prevention member that is movable along the stay arm. When the platform is in a horizontal state, the release prevention member is driven by a cam on the platform side, and the release prevention member The hook is prevented from moving in the release direction .

  In the above aspect, the stay arm is provided with a latch mechanism, and the first or second arm is provided with an engaging member that engages with the latch mechanism. The mechanism is capable of locking the engaging member, and in a state where the unlocking prevention mechanism prevents the post locking mechanism from unlocking, the latch mechanism is in a latch releasing state in which the engaging member can be released. It is good to be.

  In the above aspect, when the release preventing member and the one clamping member of the latch mechanism are connected by an extension spring, and the release prevention member is in a position to prevent movement of the hook in the release direction, the extension spring It is preferable that the holding member is operated via a pin to be in a latch release state.

  It should be noted that any combination of the above-described constituent elements, and those obtained by converting the expression of the present invention between methods and systems are also effective as aspects of the present invention.

  According to the present invention, when the elevating platform driven up and down by the elevating link mechanism can be stowed upright and the elevating platform can be opened laterally, the support arm that holds one of the pivots supporting the elevating platform is provided as a stay arm. In order to prevent the lock mechanism from being unlocked in the horizontal state of the lifting platform, the column is accidentally detached from the stay arm in the horizontal state of the lifting platform to be handled. Therefore, it is possible to improve the safety and operability.

It is a principal part structure of embodiment of the raising / lowering apparatus which concerns on this invention, Comprising: It is a principal part left view which shows the releasable state of a support | pillar lock mechanism. It is a principal part left view which similarly shows the cancellation | release prevention state of a support | pillar lock mechanism. It is a principal part front view of embodiment. It is a right view which shows the whole structure of embodiment. It is embodiment and it is the front view similarly seen from the vehicle rear part. It is the same top view. It is the left view which made the raising / lowering platform the side opening state similarly. In the embodiment, the support column is detachable from the stay arm, (A) is a left side view, and (B) is a front view. In an embodiment, it is a latch mechanism which is attached to a stay arm and holds a sub arm at its upper limit position, wherein (A) is a state before engagement, and (B) is a side view showing a state at the time of engagement. is there. It is a perspective view which shows the lock release prevention mechanism and latch mechanism which were provided in the stay arm in embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent component, member, process, etc. which are shown by each drawing, and the overlapping description is abbreviate | omitted suitably. In addition, the embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

  First, the overall configuration of the lifting apparatus according to the embodiment of the present invention will be described with reference to FIGS. 3 to 6. Reference numeral 1 denotes a van-type vehicle (box-type vehicle), and a pair of main body frames 2 are erected and fixed on the rear floor surface 1a near the rear opening of the vehicle body of the van-type vehicle. Defined the vertical and horizontal directions). A main arm 3 and a sub arm 4 constituting a substantially parallel link forming a lifting link mechanism are pivotally attached (rotatably attached) to the main body frame 2. That is, one end of the main arm 3 is pivotally attached to the main body frame 2 by the pin 3a, and one end of the sub arm 4 is pivotally attached by the pin 4a. A stay arm 5 is pivotally attached to the other end of the main arm 3 and the sub arm 4 by pins 3b and 4b. The lower portions of the pair of left and right stay arms 5 are connected to each other by a square pipe-like connecting member 5b.

  The stay arm 5 has a vertical extension portion 5a below the pivot point of the main arm 3 and the sub arm 4, and a support shaft 6 is provided in front of the vertical extension portion 5a of one stay arm 5 (right side in this example). Are attached in the vertical direction and are rotatably held. In FIG. 2, a bearing 5 c that rotatably supports the lower end portion of the support shaft 6 is shown below the right stay arm 5. On the front surface of the vertical extension 5a of the other stay arm 5 (left side in this example), a column 7 is detachably provided in a vertical direction by a column lock mechanism 20 (details will be described later). And the pivot 8 which holds the raising / lowering platform 10 is attached and fixed so that the lower end part of the support | pillar axis | shaft 6 and the lower end part of the support | pillar 7 may be connected.

  The elevating platform 10 has a main plate 11 and a tip side plate 12 on the tip side thereof connected to each other so as to be foldable by an intermediate hinge 13. The main plate 11 is rotatably supported by a pivot 8, and Two series-connected links 14 and 15 that connect between the plate 11 and the support shaft 6 and the support 7 are respectively held in a horizontal state when deployed. Accordingly, the platform 10 can be stored in the van type vehicle 1 by turning the front end side plate 12 upside down and overlapping the main plate 11 and further erecting the main plate 11 (standing substantially vertically). The unfolding operation is performed by leveling the main plate 11 and then opening and unfolding the tip end side plate 12 in an inverted state toward the tip end side of the main plate 11. A platform lock mechanism 30 having a lock pin 32 operated by an operation lever 31 is provided on the back side of the main plate 11 in order to fold and lock the platform 10 in an upright state. The lock pin 32 engages with a hole of a member provided on the support shaft 6 side when protruding.

  A single acting hydraulic cylinder 9 is connected between the pin 3b (the pivot point of the main arm 3 and the stay arm 5) and the pin 4a (the pivot point of the main body frame 2 and the sub arm 4) to drive the lifting platform 10 up and down. ing. However, the single-acting hydraulic cylinder 9 has a built-in compression spring 9a that urges the piston rod in the contracting direction. Accordingly, when the hydraulic oil in the single-acting hydraulic cylinder 9 can be discharged, the single-acting hydraulic cylinder 9 is contracted by the built-in compression spring 9a, and the main arm 3 and the sub arm 4 are counterclockwise in FIG. The platform 10 can be lowered and landed. Conversely, if hydraulic oil is supplied into the single-acting hydraulic cylinder 9, the single-acting hydraulic cylinder 9 extends to rotate the main arm 3 and the sub arm 4 clockwise, and the platform 10 is raised to the height of the rear floor 1a. Drive up to.

  Depending on the user layer, there is a case where a light load is handled, and it takes time to use a lifting device for loading or unloading, and therefore, cargo handling may be performed without using the lifting device. For this purpose, the support column 7 is detached from the stay arm 5 and the platform 10 is opened sideways with the support shaft 6 as the rotation center as shown by the phantom line in FIG. can do.

  Now, when carrying out cargo handling using the platform 10, the platform 10 is deployed horizontally and the load is placed on the platform 10, but the column lock mechanism 20 is erroneously unlocked with the load placed on the platform 10. If the column 7 is detached from one stay arm 5, the pivot 8 is supported only by the lower end of one column 6 and the apparatus may be damaged. Therefore, as shown in FIG. 1A, FIG. 1B, FIG. 2 and FIG. 9, a lock release prevention mechanism 40 that prevents the support lock mechanism 20 from being unlocked is provided.

  The column lock mechanism 20 includes an operation lever 21 and a hook 22 provided on the column 7 side, and a rod-like member 26 (for example, a round bar) fixed so as to cross the cutout window 27 on the stay arm 5 side. It is. As shown in FIGS. 7A and 7B, the lever 21 is fixed to the outer end portion of the shaft body 24 supported by the bearing 23 fixed to the side wall of the column 7, and the hook 22 is fixed to the inner end of the shaft body 24. It is fixed to the part. Therefore, the lever 21 and the hook 22 rotate in a vertical plane in conjunction with each other. The hook 22 is engaged with the rod-shaped member 26 on the stay arm 5 side from below, and a compression spring 25 is disposed in the support column 7 to urge the hook 22 in the push-up direction. Therefore, the column lock mechanism 20 holds the column 7 in the mounted state with respect to the stay arm 5 by the hook 22 engaging with the rod-shaped member 26.

  The lock release prevention mechanism 40 has a function of allowing the column lock mechanism 20 to be unlocked in the standing state of the platform 10 and preventing the column lock mechanism 20 from being unlocked in the horizontal state of the platform 10. A release prevention member 41 slidably provided on the arm 5 side and a release prevention cam 45 fixed to the side surface of the platform 10 are provided. The release prevention member 41 is slidably moved in the vertical portion 5a of the stay arm 5 to move up and down, a stopper portion 41b fixed to the upper end portion thereof, and a lower end portion of the slider portion 41a and fixed to the stay portion. The operation part 41c protrudes outside from the inner side surface of the arm 5. As shown in FIG. 9, the stopper portion 41 b is slidably supported by a guide plate 42 fixed to the stay arm 5 so as not to float from the inner wall surface of the stay arm 5. The release blocking cam 45 on the platform 10 side has a shape that pushes up the operating portion 41c from below only when the platform 10 is deployed horizontally.

  Therefore, when the platform 10 is horizontally deployed as shown in FIG. 1B from the standing state of the platform 10 of FIG. 1A, the release preventing cam 45 rotates 90 degrees from the state of FIG. 1A and protrudes from the stay arm 5. By pushing up, the slider portion 41a and the stopper portion 41b are raised, and the hook 22 is pressed from below so that the hook 22 does not fall as shown in FIGS. 1B and 9. As a result, even if the operation lever 21 is erroneously operated, the hook 22 is locked in the engaged state with the rod-like member 26, and the operation lever 21 cannot be rotated. That is, erroneous operation is reliably prevented.

  On the other hand, since the stay arm 5 is in the ascending limit position and the platform 10 is not standing, cargo handling is not performed, so it is necessary to prevent the stay arm 5 from descending when the vehicle is traveling. For this purpose, the stay arm 5 is provided with a latch mechanism 50, and the sub arm 4 is provided with an engaging member 60 that engages with the latch mechanism 50. The engaging member 60 can be locked.

  As shown in FIGS. 8A and 8B, for example, a commercially available product can be used as the latch mechanism 50, and the first engagement component 51, the second engagement component 52, and the first engagement component 51 are left. A spring that urges the second engagement member 52 in a clockwise direction and a spring that urges the second engagement component 52 clockwise. Further, the second engaging component 52 is a lever, and the rear end portion 52a and the slider portion 41a of the release preventing member 41 are connected by an extension spring 53 as shown in FIGS. 1A, 1B, and 9.

  Before the round bar portion 60a of the engagement member 60 on the sub arm 4 side engages with the latch mechanism 50, the latch mechanism 50 is in the state of FIG. 8A, and when the stay arm 5 completely reaches the ascent limit position. As shown in FIG. 8B, the round bar portion 60 a enters between the first engagement component 51 and the second engagement component 52 of the latch mechanism 50. However, if the platform 10 is in a horizontal state even when the stay arm 5 is in the ascending limit position, the release preventing member 41 is in the ascending position, and the second engagement component 52 is moved by the extension spring 53 in FIG. Since the line is driven to the unlatched state, the latching by the latch mechanism 50 is not effective. When the platform 10 is further folded at the ascending limit position of the stay arm 5 and is raised vertically, the release preventing member 41 is lowered and the second engagement component 52 is not driven by the extension spring 53, and the second engagement component 52 is 8B, the round bar 60a of the engaging member 60 is held between the first and second engaging parts 51 and 52 so as not to be removed (the latch of the latch mechanism 50 is effective). Become).

  In the above-described configuration of the lifting device, when the lifting platform 10 is deployed horizontally, the main arm 3 and the sub arm 4 are lowered so that the hydraulic oil in the hydraulic cylinder 9 can be discharged (initially by the elastic force of the compression spring 9a). Then, the stay arm 5 and the platform 10 can be lowered to the landing state as indicated by phantom lines in FIG.

  Further, the main arm 3 and the sub arm 4 are raised by supplying hydraulic oil to the hydraulic cylinder 9 from the lowered state of the lifting platform 10, and the stay arm 5 and the platform 10 can be driven up to the height of the rear floor 1a. Furthermore, as shown by the solid line in FIG. 3, the platform 10 can be folded in two and folded to stand and stored in the vehicle body. At this time, since the stay arm 5 is in the ascending limit position and the platform 10 is erected, the stay mechanism 5 is locked by the latch mechanism 50 so that the fixed engagement member 60 is not detached from the sub arm 4. As a result, the stay arm 5 does not move down due to vibration during traveling.

  Further, in the state where the platform 10 is upright, the unlocking prevention member 41 of the unlocking prevention mechanism 40 is in the lowered position, so that the unlocking of the support lock mechanism 20 is not prohibited, and the lever 21 of the support lock mechanism 20 is operated. By operating and releasing the engagement between the hook 22 and the rod-like member 26 on the one stay arm 5 side, the support column 7 is detached from the one stay arm 5 and folded in half as shown by the phantom line in FIG. The folded standing platform 10 can be in a laterally open state (a state where the platform faces the front-rear direction of the passenger compartment) with the support shaft 6 as the rotation center.

  According to the present embodiment, the following effects can be achieved.

(1) In a configuration in which an elevating link mechanism (main arm 3 and sub arm 4) is installed in a vehicle interior, and thereby the elevating platform 10 that is driven up and down can be stowed upright and the platform 10 can be opened sideways. A support lock mechanism 20 is provided for holding the support column 7 that supports one of the pivots 8 that support the platform 10 in a mounted state with respect to the stay arm 5, and prevents the support lock mechanism 20 from being unlocked when the platform 10 is in a horizontal state. Since the lock release prevention mechanism 40 is provided, it is possible to prevent the support column 7 from being accidentally detached from the stay arm 5 in the horizontal state of the platform 10 to be handled, thereby improving safety and operability. Can be achieved.

(2) At the upper limit position of the stay arm 5, the latch member 50 on the stay arm 5 side holds and locks the engaging member 60 fixed to the sub arm 4 to prevent the stay arm 5 from being lowered during unloading. be able to. At this time, the movement of the lock release preventing mechanism 40 and the latch mechanism 50 are interlocked so that the latch of the latch mechanism 50 is effective only when the stay arm 5 is in the ascending limit position and the platform 10 is in the upright state. When horizontally deployed, the latch of the latch mechanism 50 is automatically released, and operability can be improved.

(3) The extension spring 53 provided between the rear end portion 52a of the second clamping member 52 shown in FIGS. 1A, 1B, and 9 and the slider portion 41a of the release prevention member 41 is always a release prevention member. It also functions as a spring that urges 41 in the direction of pulling down, making the lowering operation of the release preventing member 41 smooth and preventing vibration and rattling.

  The present invention has been described above by taking the embodiment as an example. However, it is understood by those skilled in the art that various modifications can be made to each component and each processing process of the embodiment within the scope of the claims. By the way. Hereinafter, modifications will be described.

  In the embodiment, the hydraulic cylinder is provided between the two pins on the diagonal line among the pins located at the apex of the parallelogram of the lifting link mechanism, but it is clear that the arrangement of the hydraulic cylinder is not limited to this. The main arm may be rotated.

DESCRIPTION OF SYMBOLS 1 Van type car 1a Floor surface 2 Main body frame 3 Main arm 4 Sub arm 5 Stay arm 6 Strut shaft 7 Strut 8 Axis 9 Single acting hydraulic cylinder 10 Platform 11 Main plate 12 Front end side plate 20 Strut lock mechanism 21 Operation lever 22 Hook 25 Compression Spring 26 Bar-shaped member 27 Notch window 30 Platform lock mechanism 40 Unlocking prevention mechanism 41 Unlocking prevention member 45 Unlocking prevention cam

Claims (3)

A body frame fixed to the body floor,
A first and a second arm, each of which is provided with a substantially parallel link having one end pivotally attached to the main body frame and the other end pivotally attached to a stay arm;
A support shaft attached to one stay arm in the vertical direction and held rotatably;
A support column that is detachably attached to the other stay arm and provided in the vertical direction,
A pivot connecting the support shaft and the support shaft;
An elevating platform that is pivotably attached between the support shaft and the support shaft at the pivot;
A cylinder for rotating the first or second arm to drive the lifting platform;
A support lock mechanism that holds the support in a mounted state with respect to the stay arm;
An unlocking mechanism for allowing the column lock mechanism to be unlocked in a standing state of the lifting platform, and for preventing the column lock mechanism from being unlocked in a horizontal state of the lifting platform ,
The column lock mechanism has a hook provided on the column side and a rod-like member fixed to the stay arm side, and the hook engages with the rod-like member,
The lock release prevention mechanism includes a release prevention member that is movable along the stay arm. When the platform is in a horizontal state, the release prevention member is driven by a cam on the platform side, and the release prevention member A lifting device in which movement of the hook in the releasing direction is prevented . The stay arm is provided with a latch mechanism, and the first or second arm is provided with an engaging member that engages with the latch mechanism, and the latch mechanism is in the upper limit position of the stay arm. The joint member can be locked,
2. The lifting device according to claim 1, wherein the latch mechanism is in a latch release state in which the engagement member can be disengaged when the lock release prevention mechanism prevents the support lock mechanism from being unlocked. When the release preventing member and the one clamping member of the latch mechanism are connected by an extension spring, and the release prevention member is in a position to prevent movement of the hook in the release direction, the extension spring is used to The elevating device according to claim 2 , wherein the holding member is operated to be in a latch release state.